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Attack Cooldown is the amount of delay between the damage dealing actions of buildings or units, measured in seconds. It's a key statistic, as combined with attack damage, it defines the Damage per second (DPS) of a unit or building. To calculate DPS, a unit's attack damage is divided by the cooldown period.

There are several upgrades that reduce the attack cooldown of specific units, such as Adrenal Glands on the Zergling, which reduces the unit's attack cooldown by 0.109 seconds. The Terran ability Stimpack can be used to temporarily reduce the attack cooldown of the Marine and Marauder by 33%, thereby increasing the DPS of those units by 50%.

Attack cooldown is also an important attribute to be aware of when kiting, as the kiting units should ideally be moving during the entire cooldown period.

Ability cooldown is the minimum period of time that must pass between usages of a specific non-passive ability for a single unit or building, measured in seconds.

There are several building and unit abilities which, instead of requiring on Energy to be used, only utilize a cooldown mechanic. Examples of these include Blink and Charge. When using these abilities, a clock animation will appear over the ability icon, denoting how much of the cooldown period remains.

There are also certain abilities, such as Generate Creep, which have no cooldown period at all and may be used continuously.